.page {
    height: calc(100vh - 60px);
    position: relative;
    background-color: rgba(100, 100, 100, 0.5);
}

.content {
    width: 700px;
    height: 700px;
    border-radius: 10px;
    overflow: hidden;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}